uvm_fault(0xfffffd807ec932b0, 0x8, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at fifo_write+0x6e: movq 0x8(%rax),%r15
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*392476 22596 0 0x2 0x1 0 syz-executor
fifo_write(ffff80002a4c2cc0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd8070de7dc0,ffff80002a4c2d70,3,fffffd807f7d7340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a456290,fffffd8070de7dc0,fffffd807f7d7340,ffff80002a4c2e38,ffff80002a4c2e10) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline]
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 sys/kern/kern_ktrace.c:258
dofilereadv(ffff80002a456290,3,ffff80002a4c2fa8,0,ffff80002a4c3060) at dofilereadv+0x42c sys/kern/sys_generic.c:268
sys_read(ffff80002a456290,ffff80002a4c3110,ffff80002a4c3060) at sys_read+0xa2 sys/kern/sys_generic.c:172
syscall(ffff80002a4c3110) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76ac11debfa0, count: 7
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xfffffd807ec932b0, 0x8, 0, 1) -> e
ddb> trace
fifo_write(ffff80002a4c2cc0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd8070de7dc0,ffff80002a4c2d70,3,fffffd807f7d7340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a456290,fffffd8070de7dc0,fffffd807f7d7340,ffff80002a4c2e38,ffff80002a4c2e10) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline]
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 sys/kern/kern_ktrace.c:258
dofilereadv(ffff80002a456290,3,ffff80002a4c2fa8,0,ffff80002a4c3060) at dofilereadv+0x42c sys/kern/sys_generic.c:268
sys_read(ffff80002a456290,ffff80002a4c3110,ffff80002a4c3060) at sys_read+0xa2 sys/kern/sys_generic.c:172
syscall(ffff80002a4c3110) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76ac11debfa0, count: -8
ddb> show registers
rdi 0xfffffd8070de7dc0
rsi 0x1
rbp 0xffff80002a4c2cb0
rbx 0x4c
rdx 0
rcx 0x1
rax 0
r8 0xffff80002a4c2e10
r9 0xffff80002a4c2ec4
r10 0xfe54f05e50bac0b1
r11 0xff36e9fc47d5a11b
r12 0x4000 __ALIGN_SIZE+0x3000
r13 0xffff80002a4c2d70
r14 0xffff80002a4c2cc0
r15 0x1
rip 0xffffffff81ef275e fifo_write+0x6e
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a4c2c80
ss 0x10
fifo_write+0x6e: movq 0x8(%rax),%r15
ddb> show proc
PROC (syz-executor) tid=392476 pid=22596 tcnt=1 stat=onproc
flags process=2<EXEC> proc=1<INKTR>
runpri=84, usrpri=84, slppri=24, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a456518,0xffff800037618540
process=0xffff8000ffff8010 user=0xffff80002a4be000, vmspace=0xfffffd807ec932b0
estcpu=34, cpticks=1, pctcpu=0.0, user=5, sys=8, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
27376 173078 5956 0 3 0x80 nanoslp syz-executor
27376 243150 5956 0 2 0x4000000 syz-executor
27376 12726 5956 0 3 0x4000080 fsleep syz-executor
56212 408485 3414 0 2 0x40 syz-executor
54012 466488 83709 0 2 0 syz-executor
54012 243693 83709 0 3 0x4000080 fsleep syz-executor
54012 221727 83709 0 3 0x4000080 fsleep syz-executor
90518 179203 81320 0 2 0x100002 sh
57082 244546 74903 0 2 0 syz-executor
57082 292073 74903 0 3 0x4000080 netcon syz-executor
57082 302297 74903 0 3 0x4000080 fsleep syz-executor
81320 160681 22596 0 3 0x82 wait syz-executor
3414 441330 22596 0 3 0x82 ppwait syz-executor
73247 253685 22596 0 3 0x82 piperd syz-executor
15539 30004 22596 0 2 0x2 syz-executor
74903 376651 22596 0 2 0x482 syz-executor
7457 289152 22596 0 3 0x82 piperd syz-executor
5956 360763 22596 0 3 0x82 nanoslp syz-executor
83709 369893 22596 0 2 0x482 syz-executor
27648 14876 1 0 3 0x100083 ttyin getty
2733 428267 0 0 3 0x14200 bored sosplice
*22596 392476 67669 0 7 0x3 syz-executor
67669 276035 31523 0 3 0x10008a sigsusp ksh
31523 291441 975 0 3 0x98 kqread sshd-session
975 395752 41104 0 3 0x92 kqread sshd-session
41104 49009 1 0 3 0x88 kqread sshd
92208 258559 48885 73 2 0x1100010 syslogd
48885 152324 1 0 3 0x100082 sbwait syslogd
67969 16107 1 0 3 0x100080 kqread resolvd
81340 329873 79080 77 3 0x100092 kqread dhcpleased
98536 121137 79080 77 3 0x100092 kqread dhcpleased
79080 250292 1 0 3 0x80 kqread dhcpleased
13932 369926 0 0 3 0x14200 bored smr
60056 194600 0 0 2 0x14200 zerothread
65906 301999 0 0 3 0x14200 aiodoned aiodoned
324 514429 0 0 3 0x14200 syncer update
65077 361505 0 0 3 0x14200 cleaner cleaner
57246 403576 0 0 3 0x14200 reaper reaper
90050 288344 0 0 3 0x14200 pgdaemon pagedaemon
52274 301802 0 0 3 0x14200 bored viomb
40574 24363 0 0 3 0x40014200 acpi0 acpi0
42107 188141 0 0 3 0x14200 bored softnet3
43498 245796 0 0 3 0x14200 bored softnet2
95625 330451 0 0 3 0x14200 bored softnet1
52457 503309 0 0 3 0x14200 bored softnet0
62427 408859 0 0 3 0x14200 bored systqmp
22252 443556 0 0 3 0x14200 bored systq
68707 386528 0 0 3 0x40014200 tmoslp softclock
71421 319991 0 0 3 0x40014200 idle0
1 444190 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10210 10105K 10355K 166960K 12126 0
pcb 17 16K 18K 166960K 210 0
rtable 218 8K 9K 166960K 1981 0
pf 35 14K 22K 166960K 197 0
ifaddr 41 8K 8K 166960K 316 0
ifgroup 50 2K 2K 166960K 270 0
sysctl 1 0K 0K 166960K 1 0
counters 30 17K 17K 166960K 88 0
ioctlops 0 0K 4K 166960K 127 0
iov 0 0K 16K 166960K 70 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1392 88K 88K 166960K 2434 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 16 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 21 0
dirhash 12 2K 2K 166960K 27 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 15 53K 97K 166960K 1390 0
sigio 0 0K 0K 166960K 40 0
proc 58 59K 124K 166960K 1874 0
subproc 104 6K 6K 166960K 728 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 163 0
in_multi 89 6K 7K 166960K 634 0
ether_multi 1 0K 0K 166960K 6 0
mrt 1 0K 0K 166960K 3 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 229 1023K 1023K 166960K 229 0
exec 0 0K 2K 166960K 1097 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 191 71K 91K 166960K 11318 0
UVM aobj 87 3K 3K 166960K 87 0
pinsyscall 36 72K 106K 166960K 3644 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 30 0
NDP 13 0K 2K 166960K 179 0
temp 70 6814K 6937K 166960K 52173 0
kqueue 13 20K 30K 166960K 122 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 212 0 207 2 0 2 2 0 8 1
rtentry 112 709 0 612 4 0 4 4 0 8 1
unpcb 144 894 0 877 6 0 6 6 0 8 5
syncache 336 3 0 3 1 0 1 1 0 8 1
tcpcb 808 349 0 344 8 0 8 8 0 8 7
arp 88 116 0 99 1 0 1 1 0 8 0
ipq 40 8 0 6 1 0 1 1 0 8 0
ipqe 40 17 0 14 1 0 1 1 0 8 0
inpcb 336 1319 0 1311 10 1 9 10 0 8 8
nd6 104 168 0 148 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 0 1 1 0 8 1
kcovpl 48 56 0 48 1 0 1 1 0 8 0
ppxss 1072 7 0 7 1 0 1 1 0 8 1
pfosfp 40 1 0 0 1 0 1 1 0 8 0
pfosfpen 112 1 0 0 1 0 1 1 0 8 0
pfrktable 1344 14 0 11 1 0 1 1 0 8 0
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pfqueue 264 1 0 1 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 128 4 0 2 1 0 1 1 0 8 0
pfstate 344 2 0 1 1 0 1 1 0 8 0
pfrule 1344 16 0 5 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2545 0 2135 29 0 29 29 0 8 3
art_table 32 2546 0 2135 4 0 4 4 0 8 0
art_node 16 642 0 555 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 2 1 0 1 1 0 8 0
semapl 112 18 0 8 1 0 1 1 0 8 0
shmpl 112 84 0 0 3 0 3 3 0 8 0
dirhash 1024 27 0 10 3 0 3 3 0 8 0
dino2pl 256 2658 0 1077 99 0 99 99 0 8 0
ffsino 240 2658 0 1077 94 0 94 94 0 8 0
nchpl 144 3635 0 1893 65 0 65 65 0 8 0
uvmvnodes 80 3669 0 0 75 0 75 75 0 8 0
vnodes 216 3669 0 0 204 0 204 204 0 8 0
namei 1024 17041 0 17040 2 0 2 2 0 8 1
pfiaddrpl 120 12 0 1 1 0 1 1 0 8 0
kstatmem 264 138 0 116 2 0 2 2 0 8 0
scxspl 216 29378 0 29378 8 0 8 8 1 8 8
plimitpl 152 393 0 377 1 0 1 1 0 8 0
sigapl 424 1577 0 1533 7 0 7 7 0 8 1
futexpl 64 9451 0 9447 1 0 1 1 0 8 0
knotepl 120 22002 0 21955 17 7 10 17 0 8 8
kqueuepl 184 178 0 169 1 0 1 1 0 8 0
pipepl 288 286 0 258 3 0 3 3 0 8 0
fdescpl 432 1559 0 1532 5 0 5 5 0 8 1
filepl 120 7710 0 7461 15 0 15 15 0 8 7
lockfpl 104 240 0 237 1 0 1 1 0 8 0
lockfspl 48 95 0 92 1 0 1 1 0 8 0
sessionpl 144 70 0 62 1 0 1 1 0 8 0
pgrppl 48 132 0 116 1 0 1 1 0 8 0
ucredpl 104 799 0 788 1 0 1 1 0 8 0
zombiepl 144 1533 0 1533 1 0 1 1 0 8 1
processpl 1096 1577 0 1533 4 0 4 4 0 8 0
procpl 648 2423 0 2373 6 0 6 6 0 8 1
sosppl 168 2 0 2 1 0 1 1 0 8 1
sockpl 504 2436 0 2406 41 29 12 25 0 8 7
mcl64k 65536 4 0 4 1 0 1 1 0 8 1
mcl16k 16384 1 0 1 1 0 1 1 0 8 1
mcl9k 9216 2 0 2 1 0 1 1 0 8 1
mcl8k 8192 24 0 24 1 0 1 1 0 8 1
mcl4k 4096 6 0 6 1 0 1 1 0 8 1
mcl2k 2048 7297 0 7179 24 3 21 24 0 8 6
mtagpl 96 14 0 14 1 0 1 1 0 8 1
mbufpl 256 16697 0 16398 20 0 20 20 0 8 0
bufpl 280 7560 0 1315 447 0 447 447 0 8 0
anonpl 24 258313 0 255291 74 0 74 74 0 187 46
amapchunkpl 152 36088 0 35709 32 0 32 32 0 158 13
amappl16 200 4806 0 4798 22 13 9 15 0 8 8
amappl15 192 13 0 13 1 0 1 1 0 8 1
amappl14 184 208 0 196 1 0 1 1 0 8 0
amappl13 176 5 0 5 1 0 1 1 0 8 1
amappl12 168 2916 0 2889 3 0 3 3 0 8 1
amappl11 160 49 0 39 1 0 1 1 0 8 0
amappl10 152 11 0 11 1 0 1 1 0 8 1
amappl9 144 134 0 134 1 0 1 1 0 8 1
amappl8 136 21 0 20 1 0 1 1 0 8 0
amappl7 128 191 0 180 1 0 1 1 0 8 0
amappl6 120 635 0 633 1 0 1 1 0 8 0
amappl5 112 324 0 315 1 0 1 1 0 8 0
amappl4 104 448 0 431 1 0 1 1 0 8 0
amappl3 96 6238 0 6161 3 0 3 3 0 8 0
amappl2 88 1882 0 1810 2 0 2 2 0 8 0
amappl1 80 14134 0 13610 15 0 15 15 0 8 3
amappl 88 10601 0 10464 5 0 5 5 0 92 1
dma65536 65536 1 0 1 1 0 1 1 0 8 1
dma4096 4096 1 0 1 1 0 1 1 0 8 1
dma1024 1024 3 0 2 1 0 1 1 0 8 0
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 253 0 253 1 0 1 1 0 8 1
dma64 64 8 0 8 1 0 1 1 0 8 1
dma32 32 7 0 7 1 0 1 1 0 8 1
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 86 0 0 2 0 2 2 0 8 0
uaddrrnd 24 1559 0 1532 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1559 0 1532 1 0 1 1 0 8 0
vmmpekpl 168 13211 0 13155 3 0 3 3 0 8 0
vmmpepl 168 101481 0 99893 91 0 91 91 0 357 13
vmsppl 344 1558 0 1532 4 0 4 4 0 8 1
rwobjpl 24 34430 0 29848 29 0 29 29 0 8 0
pdppl 4096 3125 0 3064 169 98 71 83 0 8 10
pvpl 32 909466 0 901039 257 0 257 257 0 265 172
pmappl 216 1558 0 1532 3 0 3 3 0 8 1
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 512 0 131 12 0 12 12 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
fifo_write(ffff80002a4c2cc0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd8070de7dc0,ffff80002a4c2d70,3,fffffd807f7d7340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a456290,fffffd8070de7dc0,fffffd807f7d7340,ffff80002a4c2e38,ffff80002a4c2e10) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline]
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 sys/kern/kern_ktrace.c:258
dofilereadv(ffff80002a456290,3,ffff80002a4c2fa8,0,ffff80002a4c3060) at dofilereadv+0x42c sys/kern/sys_generic.c:268
sys_read(ffff80002a456290,ffff80002a4c3110,ffff80002a4c3060) at sys_read+0xa2 sys/kern/sys_generic.c:172
syscall(ffff80002a4c3110) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76ac11debfa0, count: -8
ddb> machine ddbcpu 1
No such command
ddb> trace
fifo_write(ffff80002a4c2cc0) at fifo_write+0x6e sys/miscfs/fifofs/fifo_vnops.c:281
VOP_WRITE(fffffd8070de7dc0,ffff80002a4c2d70,3,fffffd807f7d7340) at VOP_WRITE+0x102 sys/kern/vfs_vops.c:245
ktrwriteraw(ffff80002a456290,fffffd8070de7dc0,fffffd807f7d7340,ffff80002a4c2e38,ffff80002a4c2e10) at ktrwriteraw+0x191 sys/kern/kern_ktrace.c:682
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 ktrwrite2 sys/kern/kern_ktrace.c:644 [inline]
ktrgenio(ffff80002a456290,3,0,ffff800001292e10,4) at ktrgenio+0x2b6 sys/kern/kern_ktrace.c:258
dofilereadv(ffff80002a456290,3,ffff80002a4c2fa8,0,ffff80002a4c3060) at dofilereadv+0x42c sys/kern/sys_generic.c:268
sys_read(ffff80002a456290,ffff80002a4c3110,ffff80002a4c3060) at sys_read+0xa2 sys/kern/sys_generic.c:172
syscall(ffff80002a4c3110) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x76ac11debfa0, count: -8